Retainable needle construction for syringes



W. E. ANDERSON RETAINABLE NEEDLE CONSTRUCTION FOR SYRINFE? Filed Jan.1924 gwum Hem W1nr1mmE.An de-rsmn without liability of the samepermitting thev Patented Dot. 5, 1926. i 1 k i i i, I hetlflll WINDOMEDWARD ANDERSON, 0F BUFFALO, NEW YORK.-

RETAINABLFE NE n noonsrR o'rIoN, FOR SYRINGES.

Application filed January as, 1924. -Seria1 no. 689,120.

This invention relates to improvements in needles used in hypodermicmedication.

The primary object of this invention is the provision of an improvedneedle construction "for therapeutic use, which is particularly welladapted for subcutaneous, intramuscular, and int-ravenous injections,embodying means which will permit the needle to remain in position for aconsiderable period of time, according to the treatment desired. 7 i i iA further object of this invention is the provision of a needle of theabove mentioned character adapted to be used in hypodermic medication,which embodies a needle structure readily detachable with respect to asyringe, and embodying means by which the needle structure afterintravenous or intramuscular injection may remain .in position inthe'bodily tissues in a strictly aseptic condition, for an indefiniteperiod of time,

formation of a blood clot or embolus, and Without permitting admissionof air to the flesh or vein opening.

A further and important object of this invention is the provisionof aneedle struc- V ture of the above mentioned character which may beusedin the treatment of diseases or for other reasons, in which it isnecessitated that numerous injections, or blood extractions be made; theimprovedneedle by virtueof features hereinafter outlined reducing thenecessity for repeatedly needling the patient.

Other objects and advantages of this invention will be apparent duringthe course of the following detailed description. 7

In the accompanying drawing, forming a part of this specification, andwherein similar reference characters designate corresponding partsthroughout the several views.

Figure 1 is a view showing the arm of a patient with the improved needleconstruction inserted into the flesh of the arm and in such positionthat the same may remain in an aseptic andcomfortable manner,

Fig. 2 is a longitudinal cross sectional view taken through the improvedneedle construction, showing the relation of the parts thereof as theyappear when in the subcutaneous, intramuscular, or intravenous position,

Fig. 3 is a fragmentary sectional view taken longitudinally of theimproved needle construction, showing the same as connected to the endof a syringe structure,

' Fig. 4c is a side elevation of the improved needle as used with andattached to a syringe.

Fig. 5 is a cross sectional view taken sub stantially on the line 5-5 ofFigure 2.

Inthe drawing, wherein for the purpose of illustration is shown only thepreferred embodiment of this invention the letter A may generallydesignate the improved necdle proper, which may be connected to anordinary syringe 13, as by a connector piece C. A novel type of plungerdevice D is adapted to be slidably used inconneotion withthe hollow ortubular needle A after I the syringe B has been detached, and as a meansfor filling the bore or passageway of said needle against admission ofair thereto or formation of clots or other substances therein. I V

VVith ordinary hypodermic needles the insertion" and withdrawal are madealmost instantaneously. However, it is recognized thatthere are timeswhen the needle should be retained in position within the tissues. Thiscannot be done with ordinary hypopractitioners desire to administersubstances suchas bic hloride of mercury, salvarsan, sodium iodide, andthe like, frequent injections must be made, because of the fact thatinjections can only be made of very small quantities atany one time.Therefore, the

needle which'may beretained in the flesh and merely he hypodermicsyringe detached therefrom is highly desirable.

In order to accomplish the above functions the needle proper A has beenprovided,

to its pointed end and provides the passageway [14 therethroughofuniform diameter from the socket 12 to the pointed end 10.

In connection with the syringe B, which is of the conventionalstructure, including the body15,reciprocating piston 16, and at- 'dermicneedles; Especially where it is the which is of any approved material,and

tachment shank 1.7, the connecting member C is provided, which may beformed of any approved material, and provides the forward externallyscrew'threaded connecting shank 20 which is tubular in shape and adaptedtobe screw threaded into the socket 12 so that the passageway 21 thereofaligns in a flush relation with the passageway 14 of the needle A. Theconnecting piece C outwardly of its screw threaded shank end 20 isannularly enlarged, providing an enlarged body-22 within which therelatively large socket opening 24: is provided for re ceiving thetubular shank 17 of the syringe. The shank end 17 merely has africtional engagement within the socket opening 2%.

Referring to the plunger. device I) the same is only used after theinjection has been made or an extraction of blood accomplished, and itis used for the purpose of sealing the passageway 14 of the tubularneedle A in order that the needle A may remain in its subcutaneousposition. This plunger device 1) includes the relatively long shank 25,preferably of solid and externally smooth surfaced construction, thesame being circular in cross section and adapted to lit in a snugsliding engagement within the bore 14 of the needle A. At its forwardend the shank 25 is pointed by finishing this pointed end to provide aconcave surface 27 disposed at an acute angle with respect to the axisof the shank 25,

and which surface 27 will lie exactly flush with the end margin orsurface of the point- 10 of the needle A, as is illustrated in Figure 2of the drawing, the plunger device D, of course, having been fullyinserted in the needle to accomplish thisv result. At its opposite endthe shank 25 is provided with an enlarged screw threaded plug 28integrally formed therewith adapted to be screw threaded in the socket12. Outwardly of the screw threaded plug 28 a finger engaging head ordisc 29 may be formed rigid with the screw threaded portion 28, whichmay be knurled about its margin to facilitate grasp by the practitioner.This head 2-9 may be concavely cut away, as at 30, at one side thereof,so that the head 29 will not interfere with the comfort of the patientin whose body the injection has been made; the concave surface 30engaging the convex surface of the limb or body of the person in whichthe injection has been made. This concavity 30 in the head alsofurnishes an index to determine the correct position of the point of theneedle in the flesh of the patient, especially when an intravenousinjection has been made, and it furnishes an indication of the fact thatthe end surface 27 of the plunger device D is flush with the point 10.

The operation of the invention is apparent. The needle A is assembledupon the syringe B by means of the connection C prior to the making ofan injection or the extraction of a bodily fluid The needle A is thenhypodermically inserted into the flesh of the patient and in the desiredlocation, and either the injection of a substance is accomplished, ortheejection of the fluid desired. If it is desired to retainthe needle Ain the flesh of the patient it is merely necessary to detach theconnecting piece 0 from its screw threaded socket end 12 in the needle,and immediately thereafter the plunger device D may be inserted in thepassageway 1d of the needle. shank 25 snugly fills the passageway of theneedle and prevents the admission of air to The plunger I the vein or tothe opening in the flesh of the patient. It can be appreciated by thoseskilled in the art to which this invention r. relates that it is highlydesirable to prevent flush with the point 10 oftheneedle there is noliability of any suclrr'esu'lts. Air

will be prevented from entering the c'irculation system wherean'intravenous injection has been made, thus reducing liability of airembolism.

From the foregoing-description of this M invention it is apparent thatan improved needle structure for syringes has been provided whichcontemplates the retention of the needle in the body'of the patient aslong as desired. On occasions where the needle is to remain forconsiderable time the site of the insertion may be suitably bound withtape to prevent movement of the needle with respect to the insertion.

Various changes in the shape, size, and arrangement of parts may be madeto the form of this invention without departing from the spirit of thesame or the scope of the claims. 7

' I claim: v V

1. In a device of the class described the combination of a fleshinserting needle having a point on one end and an internally screwthreaded socket on the other end, and a plunger construction in saidneedle consisting of a plunger mechanism for detachable insertion insaid needle consisting of an elongated shank portion having on one endthereof a screw threaded head for inser-- tion in the screw threadedsocket of said needle and at its opposite end having a point adapted tolie in a flush relation with the point of the needle when the plungerisentirely inserted in. the needle passageway.

2. As an article of manufacture a tubular hypodermic needle having oneend thereof pointed and having the opposite end thereof provided with aninternallyscrew threaded socket, said needle from the socket end beingof uniform diameter to its pointed end, and a device for insertion inthe passageway of said needle consisting of anelongated shank adapted tofill the passageway of said needle to entirely close said passageway andhaving a screw threaded head rigid on said shank adapted to seat in thescrew threaded socket of said needle, said shank at its end adjacent thepoint having a surface adapted to lie flush with the needle pointsurface when it is fully inserted in said needle.

3. As an article of manufacture a flesh inserting hypodermic needleconstruction comprising a tubular needle provided with a passagewaytherein opening at the ends of said needle, said tubular needle at theinserting end thereof being obliquely cut from one side to the other,with respect to the axis of the needle, to provide an inserting point atthe side of the needle, a plunger reciprocably carried in saidpassageway having a pointed end formed obliquely to the axis of theplunger from one side thereof to the diametrically opposed side, andmeans to hold the plunger fully inserted in the needle at the forwardend with the forward surface of the plunger lying exactly flush with theedge of the oblique end of said tubular needle.

4:. As an article of manufacture a hypodermic needle constructioncomprising a flesh inserting tubular needle provided with a passagewaytherein and having an eccentric pointed flesh inserting end formedoblique to the axis of the needle from one side of the needle to thediametrically opposed side and being concaved at its edge, and a plungeradapted for snug sliding in the passageway of said tubular needle havinga concaved end surface formed obliquely to the axis of said plunger fromone side of the plunger to the diametrically opposed side to provide apoint, and means for maln- I taining the plungerin fully insertedrelation in said tubular needle so that the end inserting surface ofsaid plunger lies exactly flush with the oblique edge of the insertingend of the tubular needle. V

VVINDOM EDVARD ANDERSON.

